ohci: remove conditional compilation

Conditional compilation for debugging is removed in favor of
dynamic debugging. To do so

1. the support for debugfs is always compiled
2. the support for the ancient print_urb debugging aid is removed

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>